code: def test_df_norm(one, two, eigvals, lamb_ref):
      r"""Test that the norm function returns the correct 1-norm."""
      lamb = qml.resource.DoubleFactorization.norm(one, two, eigvals)
  
      assert np.allclose(lamb, lamb_ref)
  
file_path: pennylane/tests/resource/test_second_quantization.py
imports: import pytest
  import pennylane
  from pennylane import numpy
label_desc: Use image node_id 15 for calling a global function with example usage: test_df_norm(one, two, eigvals, lamb_ref) without return types